This is a demo implementation of a Linux command line tool to accessthe U-Boot's environment variables.For the run-time utiltity configuration uncomment the line#define CONFIG_FILE  "/etc/fw_env.config"in fw_env.h.See comments in the fw_env.config file for definitions for theparticular board.Configuration can also be done via #defines in the fw_env.h file. Thefollowing lines are relevant:#define HAVE_REDUND	/* For systems with 2 env sectors */#define DEVICE1_NAME	"/dev/mtd1"#define DEVICE2_NAME	"/dev/mtd2"#define DEVICE1_OFFSET    0x0000#define ENV1_SIZE         0x4000#define DEVICE1_ESIZE     0x4000#define DEVICE2_OFFSET    0x0000#define ENV2_SIZE         0x4000#define DEVICE2_ESIZE     0x4000Current configuration matches the environment layout of the TRABboard.Un-define HAVE_REDUND, if you want to use the utlities on a systemthat does not have support for redundant environment enabled.If HAVE_REDUND is undefined, DEVICE2_NAME is ignored,as is ENV2_SIZE and DEVICE2_ESIZE.The DEVICEx_NAME constants define which MTD character devices are tobe used to access the environment.The DEVICEx_OFFSET constants define the environment offset within theMTD character device.ENVx_SIZE defines the size in bytes taken by the environment, whichmay be less then flash sector size, if the environment takes lessthen 1 sector.DEVICEx_ESIZE defines the size of the first sector in the flashpartition where the environment resides.